A canister membrane filtration device and a water treatment device

Abstract

The present invention discloses a canister-type membrane filtration device, which comprises a cover body, a canister body and a partition plate. The cover body is located at the top of the canister body. The partition plate divides the cover body and the canister body into independent upper and lower chambers. A positioning plate and a number of filter columns are arranged in the lower chamber. The filter columns are arranged parallel and closely between the partition plate and the positioning plate. An upper interface is provided at the top of the cover body, and a vent hole is provided on the partition plate. The structure of the present invention is reasonable and compact, with a small floor area. The membrane filtration device uses multiple filter columns for unified water inlet, water production, flushing and drainage, saving pipelines and pipe fittings, reducing head loss, improving the uniformity of water distribution and gas distribution, and reducing the cost. After adding ribs to the partition plate, the strength of the plate is significantly enhanced, and the plate thickness can be reasonably reduced on the premise of meeting the structural stress requirements, further reducing the cost. The positioning plate effectively solves the problem of positioning of the filter columns, facilitating the installation, operation and maintenance of the device. The impact flushing method can improve the flushing effect, eliminating the need for a backwashing water tank and a backwashing water pump, further reducing the cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment equipment, and particularly relates to a tank-type membrane filtration equipment and a water treatment equipment for municipal water treatment. Background Art

[0002] Microfiltration and ultrafiltration are a type of pressure-driven membrane filtration technologies that can effectively remove macromolecular substances such as suspended particles, colloids, turbidity, and pathogenic bacteria in water. Compared with nanofiltration and reverse osmosis membrane treatment technologies, they require lower operating pressures and have great application potential in the field of water treatment.

[0003] Currently, the microfiltration membranes and ultrafiltration membranes used for municipal water treatment in the market are mainly in the form of hollow fibers. Generally, the hollow fiber membrane filaments are arranged in a shell to form a membrane element, and then the water inlet, water production, and flushing ports of multiple membrane elements are respectively connected by pipelines to form a membrane stack. Since each membrane element needs to be equipped with independent pipelines for water inlet and outlet, backwashing water, air flushing, and chemical cleaning, etc., the layout density of the membrane elements is low, the floor area is large, there are many pipe fittings, the head loss is large, the air-water distribution uniformity is poor, and the cost is high. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a tank-type membrane filtration equipment and a water treatment equipment to solve the deficiencies in the prior art.

[0005] To achieve the above purpose, the purpose of the present invention is realized through the following technical solutions:

[0006] On the one hand, a tank-type membrane filtration equipment is provided, including a cover body, a tank body, and a partition plate. The cover body is located at the top of the tank body. The partition plate divides the cover body and the tank body into independent upper and lower chambers. A positioning plate and a number of filter columns are provided in the lower chamber. The filter columns are arranged parallel and closely between the partition plate and the positioning plate. An upper interface is provided at the top of the cover body to connect external upper air inlet, external water production, external upper flushing water pipe, and external upper exhaust pipe. A number of ventilation holes are provided on the partition plate to connect external lower air inlet and external lower exhaust pipe. A lower interface is provided at the bottom of the tank body to connect external water inlet, external lower flushing water pipe, and external drain pipe.

[0007] For the tank-type membrane filtration equipment as described above, a perforated water collecting pipe is arranged inside the filter column, and a filter membrane is covered outside the filter column. The filter membrane directly wraps outside the perforated water collecting pipe or wraps outside the perforated water collecting pipe in a folded manner.

[0008] For the tank-type membrane filtration equipment as described above, the filter membrane adopts an external pressure type ultrafiltration or microfiltration membrane, and the material of the filter membrane is polyolefin, polyamide, cellulose, polyester, polypropylene, or polytetrafluoroethylene.

[0009] For the canister-type membrane filtration device as described above, a water outlet is provided at the top of the filter column for the filtered water collected by the perforated header pipe to flow out.

[0010] For the canister-type membrane filtration device as described above, a plurality of tie rods are provided in the lower chamber, and the positioning plate is suspended below the partition plate through the tie rods.

[0011] For the canister-type membrane filtration device as described above, a plurality of filter column mounting holes and upper tie rod mounting holes are provided on the partition plate, a water passing hole, a filter column positioning hole and a lower tie rod mounting hole are provided on the positioning plate, and a connecting key that can be embedded in the filter column positioning hole is provided at the bottom of the filter column. The filter column mounting hole includes an upper hole cavity with an upper hole diameter and a lower hole cavity with a lower hole diameter, the upper hole diameter is larger than the lower hole diameter, the lower hole diameter is slightly larger than the outer diameter of the filter column, a compression nut is provided in the upper hole cavity, the middle of the compression nut is a hole structure, and the hole structure is communicated with the water outlet.

[0012] For the canister-type membrane filtration device as described above, the distance between the positioning plate and the inner wall of the tank body is 5-10 mm.

[0013] For the canister-type membrane filtration device as described above, the partition plate is a single-layer plate, or ribs are welded on the single-layer plate.

[0014] For the canister-type membrane filtration device as described above, the ribs are arranged in a cross shape, a triangle or a circle.

[0015] On the other hand, a water treatment device is provided, including the canister-type membrane filtration device as described in any one of the above.

[0016] The beneficial effects of the technical solution of the present invention are:

[0017] 1. The filter columns are reasonably and compactly arranged, and the floor area is small;

[0018] 2. The membrane filtration device uses a plurality of filter columns to uniformly intake water, produce water, wash and drain water, saving pipelines and pipe fittings, reducing head loss, improving the uniformity of water distribution and gas distribution, and reducing the cost;

[0019] 3. The method of adding ribs to the partition plate can significantly enhance the strength of the plate, reasonably reduce the plate thickness on the premise of meeting the structural stress requirements, and further reduce the cost;

[0020] 4. The positioning plate effectively solves the problem of filter column positioning, facilitating the installation, operation and maintenance of the device;

[0021] 5. The adopted impact flushing method can improve the flushing effect, eliminating the need for a backwashing water tank and a backwashing water pump, and further reducing the cost. Description of the Drawings

[0022] To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Figure 1 Cross-sectional view of the canister-type membrane filtration device according to a preferred embodiment of the present invention;

[0024] Figure 2 Cross-sectional view of the filter column according to a preferred embodiment of the present invention;

[0025] Figure 3 Top view of the filter column according to a preferred embodiment of the present invention;

[0026] Figure 4 Bottom view of the partition plate according to a preferred embodiment of the present invention;

[0027] Figure 5 A-A cross-sectional view of the partition plate according to a preferred embodiment of the present invention;

[0028] Figure 6 Installation detail drawing of the filter column and the partition plate according to a preferred embodiment of the present invention;

[0029] Figure 7a 、 Figure 7b Cross-sectional view and top view of the compression nut according to a preferred embodiment of the present invention, respectively;

[0030] Figure 8 Top view of the positioning plate according to a preferred embodiment of the present invention;

[0031] Figure 9 Schematic diagram of the partition plate with ribs according to a preferred embodiment of the present invention;

[0032] Wherein: 1. Cover body; 2. Partition plate; 3. Tank body; 5. Positioning plate; 6. Pull rod; 7. Filter column; 8. Lower interface; 9. Lower flushing water pipe; 10. Vent pipe; 11. Upper interface; 12. Upper flushing water pipe; 13. Upper exhaust pipe; 14. Lower exhaust pipe; 15. Lifting lug; 16. Support foot; 17. Connecting key; 18. Water production port; 19. Vent hole; 20. Filter column installation hole; 21. Upper pull rod installation hole; 22. Filter column positioning hole; 23. Lower pull rod installation hole; 24. Water passing hole; 25. Compression nut; 28. Filter membrane; 29. Perforated water collecting pipe; 30. Rib. Detailed implementation manners

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. The advantages and features of the present invention will be clearer according to the following description and the claims. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0034] Refer to Figure 1 、Figure 5 and Figure 6 As shown in Figure 6 , the canister membrane filtration equipment of the present invention mainly includes a canister 3, a cover 1, and a partition plate 2. The cover 1 is located at the top of the canister 3. The partition plate 2 divides the cover 1 and the canister 3 into independent upper and lower chambers. A positioning plate 5 and several filter columns 7 are arranged in the lower chamber. The filter columns 7 are arranged parallel and closely between the partition plate 2 and the positioning plate 5. An upper interface 11 is provided at the top of the cover 1 for connecting external upper air intake, external product water, external upper flushing water pipe 12, and external upper exhaust pipe 13. A lower interface 8 is provided at the bottom of the canister 3 for connecting external water inlet, external lower flushing water pipe 9, and external drain pipe 10. Several ventilation holes 19 are provided on the partition plate 2 for connecting external lower air intake and external lower exhaust pipe 14, so as to realize the unified water inlet, product water, flushing, and drainage of multiple filter columns 7. Preferably, the cover 1 is provided with lifting lugs 15 to facilitate the installation and maintenance of the equipment, and support feet 16 are provided at the lower part of the canister 3.

[0035] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 7a 、 Figure 7b and Figure 8 As shown in Figure 8 , a perforated water collecting pipe 29 is arranged inside the filter column 7, and a filter membrane 28 is covered outside. The filter membrane 28 can be an external pressure ultrafiltration or microfiltration membrane. The material of the membrane can be polyolefin, polyamide, cellulose, polyester, polypropylene, or polytetrafluoroethylene, etc., or other materials that can provide a filtering effect. The arrangement form of the filter membrane 28 can be wrapped around the perforated water collecting pipe 29 in folds, or directly wrapped around the perforated water collecting pipe 29.

[0036] A product water outlet 18 is left at the top of the filter column 7 for the filtered water collected by the perforated water collecting pipe 29 to flow out. Multiple pull rods 6 are arranged in the lower chamber, and the positioning plate 5 is suspended below the partition plate 2 through the pull rods 6.

[0037] As Figure 4 、 Figure 5 、 Figure 6 、 Figure 7a 、 Figure 7b and Figure 9 As shown in Figure 9 , several ventilation holes 19, filter column installation holes 20, and upper pull rod installation holes 21 are provided on the partition plate 2. The ventilation holes 19 are used for air intake and exhaust of the lower space of the partition plate 2. One end of the ventilation hole 19 is arranged at the edge of the partition plate 2, and the other end is arranged at the lower part of the partition plate 2. The ventilation holes 19 can be 3, or multiple.

[0038] As Figure 8As shown, the positioning plate 5 is provided with a water passing hole 24, a filter column positioning hole 22, and a lower pull rod mounting hole 23. During installation, the pull rod 6 passes through the positioning plate 5 and the partition plate 2, and the positioning plate 5 is suspended below the partition plate 2. The positioning plate 5 does not directly contact the inner wall of the tank body 3. Preferably, the spacing distance is 5-10 mm.

[0039] The bottom of the filter column 7 is provided with a water-impermeable part that can be embedded in the filter column positioning hole 22 to fix the position of the filter column 7. The filter column mounting hole 20 includes an upper hole cavity with an upper hole diameter and a lower hole cavity with a lower hole diameter. The upper hole diameter is larger than the lower hole diameter, and the lower hole diameter is slightly larger than the outer diameter of the filter column 7 for installing the filter column 7. A compression nut 25 is provided in the upper hole cavity. The compression nut 25 is used to fix the filter column 7. The middle part of the compression nut 25 is a hole structure that communicates with the water production port 18. While fixing the filter column 7, it does not block the water production port 18 at the top of the filter column 7.

[0040] The connecting key 17 at the lower part of the filter column 7 is nested in the filter column positioning hole 22 reserved on the positioning plate 5. The upper end of the filter column 7 is nested in the filter column mounting hole 20 reserved on the partition plate 2. The positioning plate 5 is suspended below the partition plate 2 by multiple pull rods 6. A compression nut 25 is installed at the upper part of the filter column mounting hole 20 reserved on the partition plate 2 to fix the filter column 7.

[0041] The partition plate 2 is arranged between the cover body 1 and the tank body 3 and is fixed by flanges. The partition plate 2 can be a single-layer plate, or ribs 30 can be welded on the single-layer plate to reduce the thickness of the single-layer plate and reduce the cost. The ribs 30 can be arranged in a cross shape, or in a triangular or circular shape.

[0042] As Figure 1 、 Figure 4 and Figure 8 shown, the pull rod 6 is installed between the positioning plate 5 and the partition plate 2. Preferably, the diameter of the pull rod is 20-40 mm, and the number of pull rods is 4-20. It can be made of stainless steel and is fixed to the positioning plate 5 and the partition plate 2 with screws.

[0043] During water treatment, the drain pipe 10 is closed, and the inlet and lower flushing water pipe 9, the upper air inlet, the water production and upper flushing water pipe 12, the upper exhaust pipe 13, and the lower air inlet and lower exhaust pipe 14 are opened. The water to be treated enters the tank body 3 through the inlet and lower flushing water pipe 9, and enters the external space of the filter column 7 through the water passing hole 24 of the positioning plate 5 or the gap between the positioning plate 5 and the tank body 3. When the water level rises to the lower part of the partition plate 2, the lower air inlet and lower exhaust pipe 14 are closed. The inlet water is filtered by the filter membrane 28, and the produced water enters the internal perforated collecting pipe 29 and enters the independent chamber formed by the cover body 1 and the partition plate 2 through the water production port 18 at the top of the filter column 7. When the water level rises to the bottom of the upper exhaust pipe 13, the upper exhaust pipe 13 is closed, and the produced water is led out through the upper air inlet, the water production and upper flushing water pipe 12.

[0044] The flushing is divided into physical cleaning and chemical cleaning. During physical cleaning, the upper air inlet, water production, upper flushing water pipes 12, upper exhaust pipe 13, water inlet and lower flushing water pipe 9 are closed, the lower air inlet, lower exhaust pipe 14 and vent pipe 10 are opened. Gas with a pressure of about 0.2 MPa enters the upper part of the space enclosed by the tank body 3 and the partition plate 2 through the air inlet and lower exhaust pipe 14. When the gas volume accounts for about 1 / 4 of the tank volume, the air inlet is stopped, the air inlet and lower exhaust pipe 14 are closed, the upper air inlet, water production and upper flushing water pipes 12 are opened. Gas with a pressure of about 0.6 MPa enters the space enclosed by the cover body 1 and the partition plate 2 through the upper air inlet, water production and upper flushing water pipes 12, pushing the water therein to quickly drain downward, and discharging through the water production port 18 at the top of the filter column 7, the perforated collecting pipe 29, the filter membrane 28, the water passing holes 24 of the positioning plate 5 or the gap between the positioning plate 5 and the tank body 3, and the vent pipe 10, so as to realize the cleaning of the pollutants accumulated on the surface area of the filter membrane 28. During chemical cleaning, the vent pipe 10 is closed, and the water inlet and lower flushing water pipe 9, the upper air inlet, water production and upper flushing water pipes 12, the upper exhaust pipe 13 and the lower air inlet and lower exhaust pipe 14 are opened. The solution added with the cleaning agent enters the tank body 3 through the water inlet and lower flushing water pipe 9, and enters the external space of the filter column 7 through the water passing holes 24 of the positioning plate 5 or the gap between the positioning plate 5 and the tank body 3. When the water level rises to the lower part of the partition plate 2, the lower air inlet and lower exhaust pipe 14 are closed. The solution added with the cleaning agent is filtered through the filter membrane 28, and the filtered water enters the internal perforated collecting pipe 29, and enters the independent chamber enclosed by the cover body 1 and the partition plate 2 through the water production port 18 at the top of the filter column 7. When the water level rises to the bottom of the upper exhaust pipe 13, the upper exhaust pipe 13 is closed. The filtered water is led out to the external chemical cleaning water tank through the upper air inlet, water production and flushing water pipes 12, and then enters the water inlet and lower flushing water pipe 9 for circulating cleaning. The agents used for chemical cleaning can be agents such as sodium hypochlorite, sodium hydroxide, citric acid or hydrochloric acid. Before and after chemical cleaning, physical cleaning is required.

[0045] The filter columns of the present invention are reasonably and compactly arranged, with a small floor area; the membrane filtration equipment uses multiple filter columns for unified water inlet, water production, flushing and drainage, saving pipelines and pipe fittings, reducing head loss, improving the uniformity of water distribution and gas distribution, and reducing the cost; the partition plate with ribs can significantly strengthen the strength of the plate, and reasonably reduce the plate thickness on the premise of meeting the structural stress requirements, further reducing the cost; the positioning plate effectively solves the problem of filter column positioning, facilitating the installation, operation and maintenance of the equipment; the adopted impact flushing method can improve the flushing effect, eliminating the backwashing water tank and backwashing water pump, and further reducing the cost.

[0046] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A canister-type membrane filtration device, characterized in that, It includes a cover body (1), a tank body (3) and a partition plate (2). The cover body (1) is located at the top of the tank body (3). The partition plate (2) divides the cover body (1) and the tank body (3) into independent upper and lower chambers. A positioning plate (5) and several filter columns (7) are arranged in the lower chamber. The filter columns (7) are arranged closely and parallel to each other between the partition plate (2) and the positioning plate (5). An upper interface (11) is provided at the top of the cover body (1) to connect an external upper air inlet, an external water production, an external upper flushing water pipe (12) and an external upper exhaust pipe (13). Several ventilation holes (19) are provided on the partition plate (2) to connect an external lower air inlet and an external lower exhaust pipe (14). A lower interface (8) is provided at the bottom of the tank body (3) to connect an external water inlet, an external lower flushing water pipe (9) and an external drain pipe (10). A plurality of tie rods (6) are arranged in the lower chamber. The positioning plate (5) is suspended from the lower part of the partition plate (2) through the tie rods (6). There is a gap between the positioning plate (5) and the inner wall of the tank body (3), and the gap distance is 5-10 mm.

2. The pot-type membrane filtration device according to claim 1, characterized in that, A perforated water collecting pipe (29) is arranged inside the filter column (7), and a filter membrane (28) is covered outside the filter column (7). The filter membrane (28) directly wraps outside the perforated water collecting pipe (29) or wraps outside the perforated water collecting pipe (29) in a folded manner.

3. The pot-type membrane filtration device according to claim 2, wherein, The filter membrane (28) adopts an external pressure type ultrafiltration or microfiltration membrane, and the material of the filter membrane (28) is polyolefin, polyamide, cellulose, polyester, polypropylene or polytetrafluoroethylene.

4. The pot type membrane filtration device according to claim 2, wherein, A water production port (18) is provided at the top of the filter column (7) for the filtered water collected by the perforated water collecting pipe (29) to flow out.

5. The canister type membrane filtration device according to claim 1, wherein Several filter column mounting holes (20) and upper tie rod mounting holes (21) are provided on the partition plate (2). A water passing hole (24), a filter column positioning hole (22) and a lower tie rod mounting hole (23) are provided on the positioning plate (5). A connecting key (17) that can be embedded in the filter column positioning hole (22) is provided at the bottom of the filter column (7). The filter column mounting hole (20) includes an upper hole cavity with an upper hole diameter and a lower hole cavity with a lower hole diameter. The upper hole diameter is larger than the lower hole diameter, and the lower hole diameter is slightly larger than the outer diameter of the filter column (7). A compression nut (25) is arranged in the upper hole cavity. The middle part of the compression nut (25) is a hole structure, and the hole structure is communicated with the water production port (18).

6. The canister-type membrane filtration device according to claim 1, wherein The partition plate (2) is a single-layer plate, or ribs (30) are welded on the single-layer plate.

7. The canister type membrane filtration equipment according to claim 6, wherein, The ribs (30) are arranged in a cross shape, a triangle or a circle.

8. A water treatment device, characterized in that, It includes a tank type membrane filtration device as described in any one of claims 1 to 7.

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